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<title>Using as: Z80 Options</title>

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<a name="Z80-Options"></a>
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<p>
Next: <a href="Z80-Syntax.html#Z80-Syntax" accesskey="n" rel="next">Z80 Syntax</a>, Up: <a href="Z80_002dDependent.html#Z80_002dDependent" accesskey="u" rel="up">Z80-Dependent</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Options-29"></a>
<h4 class="subsection">9.53.1 Options</h4>
<a name="index-Z80-options"></a>
<a name="index-options-for-Z80"></a>
<p>The Zilog Z80 and Ascii R800 version of <code>as</code> have a few machine
dependent options.
</p><dl compact="compact">
<dd><a name="index-_002dz80-command-line-option_002c-Z80"></a>
</dd>
<dt><samp>-z80</samp></dt>
<dd><p>Produce code for the Z80 processor. There are additional options to
request warnings and error messages for undocumented instructions.
</p></dd>
<dt><samp>-ignore-undocumented-instructions</samp></dt>
<dt><samp>-Wnud</samp></dt>
<dd><p>Silently assemble undocumented Z80-instructions that have been adopted
as documented R800-instructions.
</p></dd>
<dt><samp>-ignore-unportable-instructions</samp></dt>
<dt><samp>-Wnup</samp></dt>
<dd><p>Silently assemble all undocumented Z80-instructions.
</p></dd>
<dt><samp>-warn-undocumented-instructions</samp></dt>
<dt><samp>-Wud</samp></dt>
<dd><p>Issue warnings for undocumented Z80-instructions that work on R800, do
not assemble other undocumented instructions without warning.
</p></dd>
<dt><samp>-warn-unportable-instructions</samp></dt>
<dt><samp>-Wup</samp></dt>
<dd><p>Issue warnings for other undocumented Z80-instructions, do not treat any
undocumented instructions as errors.
</p></dd>
<dt><samp>-forbid-undocumented-instructions</samp></dt>
<dt><samp>-Fud</samp></dt>
<dd><p>Treat all undocumented z80-instructions as errors.
</p></dd>
<dt><samp>-forbid-unportable-instructions</samp></dt>
<dt><samp>-Fup</samp></dt>
<dd><p>Treat undocumented z80-instructions that do not work on R800 as errors.
</p>
<a name="index-_002dr800-command-line-option_002c-Z80"></a>
</dd>
<dt><samp>-r800</samp></dt>
<dd><p>Produce code for the R800 processor. The assembler does not support
undocumented instructions for the R800.
In line with common practice, <code>as</code> uses Z80 instruction names
for the R800 processor, as far as they exist.
</p></dd>
</dl>

<a name="index-Z80-Syntax"></a>



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